Monsoon moisture and an upper level low fueled thunderstorms over the Mojave Desert. Several storms produced severe weather and flash flooding.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS VEF wrote it up.
Monsoon moisture and an upper level low fueled thunderstorms over the Mojave Desert. Several storms produced severe weather and flash flooding.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Las Vegas, NV wrote its last area forecast discussion before the first event at Sep 10, 9:23 PM PST, 37 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LAS VEGAS NV 1023 PM PDT SAT SEP 10 2011 .SYNOPSIS...SCATTERED SHOWERS AND THUNDERSTORMS WILL CONTINUE THROUGH THIS EVENING...WITH SOME STORMS PERSISTING OVERNIGHT. THE MAIN THREAT WITH THESE STORMS WILL BE LOCALLY HEAVY RAIN. THUNDERSTORM COVERAGE WILL DECREASE SUNDAY AND MONDAY AS SOME DRIER AIR SPREADS NORTHWARD ACROSS SOUTHERN CALIFORNIA AND SOUTHERN NEVADA. && .AVIATION...FOR MCCARRAN...THE LATEST RADAR TRENDS AND WRF MODEL SUGGEST THAT AN AREA OF SHRA/TSRA CURRENTLY STRETCHING FROM NORTHEAST SAN BERNARDINO COUNTY ACROSS SOUTHERN CLARK COUNTY AND INTO CENTRAL MOHAVE COUNTY WILL MOVE NORTHWARD TONIGHT AND WHILE HOW CONTINUOUS THIS LINE GETS IS A BIT UNCERTAIN AT THIS TIME...IT APPEARS THAT SHRA/TSRA WILL MAKE A MOVE TOWARDS THE LAS VEGAS VALLEY BY 08Z SUNDAY. THE MAIN THREATS IN AND NEAR TSRA WILL BE GUSTY AND ERRATIC WINDS AS WELL AS THE POTENTIAL FOR LOWER CIGS AND VSBY NEAR ANY HEAVIER STORMS. THIS ACTIVITY SHOULD PUSH NORTH OF THE LAS VEGAS VALLEY BETWEEN 13Z-14Z SUNDAY. AFTERWARDS IT APPEARS THAT ENOUGH DRY AND STABLE AIR WILL MOVE IN TO SIGNIFICANTLY LIMIT THE POTENTIAL FOR ANY SHRA/TSRA DURING THE REMAINDER OF SUNDAY IN THE LAS VEGAS VALLEY. THERE WILL BE A CHANCE OF SHRA/TSRA IN ALL OF THE APPROACH CORRIDORS OVERNIGHT AND IN THE PEACH SPRINGS...MORMON MESA AND BEATTY CORRIDORS AFTER 14Z SUNDAY. FEW-SCT CLOUDS AOA 10K FEET ARE EXPECTED OVER THE LAS VEGAS VALLEY AFTER 14Z SUNDAY. AWAY FROM TSRA OR ANY OUTFLOW BOUNDARIES WINDS WILL FAVOR TYPICAL DIURNAL DIRECTIONS AT SPEEDS OF 10 KTS OR LESS. FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST CALIFORNIA...SCT SHRA AND TSRA WILL CONTINUE OVERNIGHT ACROSS THE AREA ESPECIALLY OVER THE SAN BERNARDINO COUNTY DESERTS...CLARK... SOUTHERN NYE AND MOST OF MOHAVE COUNTY. A PUSH OF DRY AND STABLE AIR SHOULD SIGNIFICANTLY LIMIT SHRA/TSRA ACTIVITY OVER THE SAN BERNARDINO COUNTY DESERTS...MOST OF CLARK AND SOUTHERN NYE COUNTIES ON SUNDAY FROM THE MID MORNING HOURS ON. SCT SHRA AND TSRA ARE EXPECTED OVER MOHAVE...INYO...ESMERALDA...CENTRAL NYE AND LINCOLN COUNTIES. THE MAIN THREATS IN AND NEAR STORMS WILL BE GUSTY AND ERRATIC WINDS WITH REDUCED CIGS AND VSBY POSSIBLE NEAR HEAVIER STORMS. OTHERWISE WINDS WILL FAVOR TYPICAL DIURNAL DIRECTIONS AT 10 KTS OR LESS WITH SCT CLOUDS AOA 10K FEET. && .PREVIOUS UPDATE... 855 PM PDT SAT SEP 10 2011 .UPDATE...AREA OF STRONG TO AT TIMES SEVERE THUNDERSTORMS CONTINUES ACROSS A LARGE PORTION OF SAN BERNARDINO COUNTY AND IS NOW BEGINNING TO MOVE INTO SOUTHERN INYO COUNTY. AN APPROXIMATE 50 KT JET MAX CONTINUES TO NOSE INTO THE SOUTHERN PORTIONS OF THE CWFA AROUND THE BASE OF THE UPPER LOW LOCATED ALONG THE SOUTHERN COAST OF CALIFORNIA. THIS PLACES MUCH OF SAN BERNARDINO IN A CONDUCIVE LOCATION FOR THUNDERSTORM DEVELOPMENT AND ENHANCEMENT....STRONG UPPER LEVEL DIVERGENCE COUPLED WITH DECENT LOW LEVEL CONVERGENCE. WE HAVE SEEN VERY STRONG...60 KT LOW LEVEL VELOCITY SIGNATURES WITH SEVERAL STORMS. WE HAVE RECEIVED SEVERAL REPORTS OF HAIL...THE LARGEST BEING QUARTER SIZE HAIL IN BAKER. THREE CELLS ALONG INTERSTATE 15 THE FIRST TO THE WEST OF BAKER...THE SECOND IN BAKER AND THE THIRD BETWEEN BAKER AND MOUNTAIN PASS ALL HAD SIGNATURES INDICATING SEVERE HAIL. MADE MINOR CHANGES TO INCREASE POPS ACROSS MUCH OF SAN BERNARDINO COUNTY FOR THE REST OF THE NIGHT. .PREVIOUS DISCUSSION... ISSUED AT 238 PM PDT SAT SEP 10 2011 .SHORT TERM...MAIN FEATURE OF INTEREST BESIDES THE MAIN UPPER LOW OFF THE SOUTHERN CALIFORNIA COAST HAS BEEN A SMALL SCALE CIRCULATION WHICH HAS MOVED SLOWLY NORTH OUT OF SAN BERNARDINO COUNTY AND THROUGH WESTERN CLARK COUNTY TODAY. THIS CIRCULATION COULD BE A LEFTOVER VORTEX FROM THE STRONG CONVECTION OVERNIGHT IN SAN BERNARDINO COUNTY...A SMALLER CIRCULATION WHICH GOT LEFT BEHIND AS THE NUMEROUS SMALLER CIRCULATIONS YESTERDAY CONSOLIDATED INTO THE MAIN UPPER CIRCULATION...OR SOME COMBINATION THEREOF. AT ANY RATE...IT HAS FOCUSED RAIN AND THUNDERSTORMS FOR MUCH OF THE DAY. AROUND THE PERIPHERY OF OUR CWA...ISOLATED STORMS WERE DEVELOPING OVER THE MOUNTAINS...EXCEPT FOR AN ARC FROM THE MORONGO BASIN UP TO BOULDER CITY AND BACK DOWN TO LAKE HAVASU...WHERE SKIES WERE MOSTLY CLEAR IN THE WAKE OF THE AFOREMENTIONED CIRCULATION. REDUCED POPS AND SKY COVER IN THIS AREA...BUT NOT QUITE AS MUCH AS SATELLITE LOOP WOULD SUGGEST...AS SPC ANALYSIS SHOWS THIS AREA REMAINS MOIST AND UNSTABLE. OTHERWISE...NOT A WHOLE LOT OF CHANGE TO THE PREVIOUS FORECAST. MODELS STILL SHOW A VERY WELL DEFINED DRY SLOT PUNCHING NORTH THROUGH THE MIDDLE OF OUR CWA SUNDAY AND MONDAY...WHICH SUGGESTS THE GREATEST COVERAGE OF AFTERNOON STORMS COULD BE ON THE WEST AND EAST FRINGES OF THE CWA WITH A MINIMUM IN BETWEEN. SOUTH WINDS COULD GET A LITTLE BREEZY IN THE DRY SLOT WHERE MIXED LAYER DEPTH IS MAXIMIZED. TEMPERATURES WILL BE HIGHLY DEPENDENT ON TIMING AND LOCATION OF PRECIP. .LONG TERM...TUESDAY THROUGH SATURDAY. DUE TO ACTIVE WEATHER IN THE SHORT TERM LESS TIME WAS DEVOTED TO THE LONG TERM FORECAST. MODELS OVERALL AGREE ON MOVING THE UPPER LOW THROUGH ON WEDNESDAY. MODELS ALSO KEEP THE MOISTURE ON THE SKIMPY SIDE FOR THE WESTERN PART OF THE CWA TUESDAY AND WEDNESDAY AND BETTER AMOUNTS ON THE EAST AND SOUTHEAST SIDES OF THE CWA AHEAD OF THE TROUGH. KEPT THE BEST POPS IN THE SOUTHEAST WHERE MOISTURE AND DYNAMICS OF THE ADVANCING LOW COMBINE. IF PRESENT MODELS TRENDS OF LOWER MOISTURE/PW VALUES CONTINUE...THE POPS MAY NEED LOWERING EVEN MORE...ESPECIALLY IN THE WESTERN ZONES. WEAK AND BRIEF RIDGING MOVES IN THURSDAY.FOLLOWED BY A PACIFIC NORTHWEST TROUGH ON IT HEELS. THIS TROUGHING WILL BRING IN A WEST TO SOUTHWEST FLOW AT THE END OF THE WEEK. FOR NOW WILL CONTINUE THE DRYING TREND THIS WILL PORTENDS AND KEEP MENTION OF POPS DUE TO THIS FEATURE OUT OF THE PICTURE FOR NOW. && .VEF WATCHES/WARNINGS/ADVISORIES... NV...NONE. AZ...NONE. CA...NONE. && AVIATION...STACHELSKI UPDATE...CZYZYK PREVIOUS...MORGAN/JACQUES HTTP://WEATHER.GOV/LASVEGAS
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
727 PM PDT SAT SEP 10 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0700 PM HAIL 1 SSW BAKER 35.26N 116.08W
09/10/2011 E1.00 INCH SAN BERNARDINO CA PUBLIC
TWO SEPERATE REPORTS OF HAIL AT LEAST QUARTER SIZE IN
BAKER...ONE FROM IHOP AND THE OTHER FROM A CONVENIENCE
STORE. HAIL COVERED THE GROUND AND WAS STILL THERE TWENTY
MINUTES LATER.
&&
STACHELSKIPRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE LAS VEGAS NV
812 PM PDT SAT SEP 10 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0700 PM HAIL 1 SSW BAKER 35.26N 116.08W
09/10/2011 E1.00 INCH SAN BERNARDINO CA PUBLIC
TWO SEPERATE REPORTS OF HAIL AT LEAST QUARTER SIZE IN
BAKER...ONE FROM IHOP AND THE OTHER FROM A CONVENIENCE
STORE. HAIL COVERED THE GROUND AND WAS STILL THERE TWENTY
MINUTES LATER.
0740 PM HEAVY RAIN 1 SSW BAKER 35.27N 116.08W
09/10/2011 E1.00 INCH SAN BERNARDINO CA TRAINED SPOTTER
A SPOTTER REPORTED AROUND 4 INCHES OF WATER ON HIGHWAY
127 IN BAKER.
0752 PM HAIL 3 NE BARSTOW 34.91N 117.03W
09/10/2011 E0.25 INCH SAN BERNARDINO CA LAW ENFORCEMENT
CALIFORNIA HIGHWAY PATROL OFFICER REPORTED PEA SIZE HAIL
ON OLD HIGHWAY 58 NEAR BARSTOW.
0809 PM HAIL 2 SW TWENTYNINE PALMS 34.12N 116.09W
09/10/2011 E0.25 INCH SAN BERNARDINO CA TRAINED SPOTTER
&&
STACHELSKIPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
936 PM PDT SAT SEP 10 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0909 PM FLASH FLOOD 10 NNW DAGGETT 35.00N 116.94W
09/10/2011 SAN BERNARDINO CA LAW ENFORCEMENT
CALIFORNIA HIGHWAY PATROL REPORTED IRWIN ROAD JUST WEST
OF FORT IRWIN ROAD HAS A FEW SPOTS WERE AT LEAST 6 INCHES
OF WATER COVERED THE ROAD AND THE ROAD WAS NOT PASSABLE.
0925 PM HAIL 1 ENE YUCCA VALLEY 34.12N 116.42W
09/10/2011 E0.25 INCH SAN BERNARDINO CA TRAINED SPOTTER
&&
STACHELSKIThe Las Vegas radar (KESX), 35 km away, was scanning. The volume nearest the first event began at 06:02 UTC.
1 lightning, 1 flash flood, 1 hail, 1 thunderstorm wind. Local standard time, as filed.
Lightning struck a home in the Anthem area of Henderson, causing minor damage.
A few inches of water flooded the Circus Circus Adventuredome, a foot or more of water flooded homes on 15th Street between Charleston and Fremont, a car near Alexander and Losee was stranded in water up to its windows, and a few inches of water got into the Cannery Casino and the attached movie theater. In addition, several cars in the Cannery parking lot were flooded.
A spotter estimated 60 mph winds from a thunderstorm.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nevada in 2011Every state in 2011This day in weather historyWarnings in Nevada, September 2011
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 334117, 334102, 334084, 334089.